Measurements of the remanent magnetization of sediments from the Colorado Plateau, ranging in age from the Algonkian to the Cretaceous, are reported. In some cases the stability of the magnetizations is clear, but in other cases instability is present to a degree for which corrections can be made. The original magnetizations are presumed to have been along the geomagnetic field at the time of deposition. Thus the position of the mean magnetic pole for five epochs is determined and compared with the pole positions calculated on the basis of measurements of strata in Great Britain. The agreement is sufficiently close to give strong support to the hypothesis of polar wandering.